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MEXICAN EXPERIENCES ON RPV SURVEILLANCE MATERIALS
Ing. Magdalena Griz Cruz.(CFE)M. Sc. Carlos Arganis ININ. (ININ).M. Sc. Eduardo F. Robles P. (ININ)Eng. Francisco J. Merino C. (ININ)M. Sc. Rogelio Hernandez C. (ININ)
June 2009 2
CONTENTS
GENERAL DATA
AGEGING MANAGEMENT PROGRAM
RPV SURVEILLANCE PROGRAM
COOPERATION RESEARCH PROYECT
June 2009 3
GENERAL DATA
Laguna Verde general data:
Two units X 682.44 net MWe
Reactor type: Boiling Water reactor (BWR 5)
Nominal pressure: 79.69 Kg/cm2
Control: 109 SS control rods with Boron carbide
Steam flow: 3961.3 ton/hr
Feed water flow:3950 ton/hr
Vessel: made of carbon steel internally clad with stainless steel. Total heigth= 20.8 m, = 5.30 m and Thickness from 13 to 18 cm.
June 2009 4
GENERAL DATA (cont.)
Vessel specification and design: welded construction. Design by GE and manufactured by Chicago Bridge & Iron
Designed, fabricated, tested and inspected in accordance with ASME code, section III. Reactor and its support system meet seismic category I.
Shell & bottom head section were made of low alloy steel and were internally clad with SS 304
June 2009 5
Service conditions
OPERATING POWER:
2027 MWt (105 % of nuclear rated power)120% EPU programmed for 2010 both units.
VESSEL DOME PRESSURE:
79.69 Kg/cm2
TEMPERATURE
282°C
STEAM FLOW
3961.3 Ton/h (105% of nuclear boiler rated steam flow.
June 2009 6
Materials & fabrication
Constructed from low alloy, high strength steel plate and forging
Plate of SA 533 Gr. B Cl1, forgings of SA 508 class 2.
Studs, nuts and washers for main closure flange are of SA 540 Gr.B23 or B24
Submerged arc and manual electrode welding processes were employed.
June 2009 7
AMP´s for both units.
June 2009 8
MATRIX COMPONENT-AGING MECHANISM
COMPONENTAging Mechanism
Remarks/documents for reviewNeut.
EmbritFatigue IGSCC &
IASCC
Beltline plates & welds Signific.
Surveillance program, compare with others plants programs. Participation of LV in ISP
Top head N/A N/A N/AReview nonconformance reports/ potential FAC/ external operational experience.
Bottom head N/A N/A N/A
Main closure flange N/A Potenti
al N/A Review usage factor
Nozzles (full penetration) LPCI CRDRL
& FW N/A Verify return line/ conditions of NUREG 0619/ BWRVIP
Nozzle welds CRD (3) N/A Potenti
al Potential Review materials, conditions & programs (IVVI´s)
June 2009 9
LAGUNA VERDE SURVEILLANCE PROGRAM
BELTLINE PLATES & WELDS
SURVEILLANCE PROGRAM BASED ON APPENDIXES H & G OF 10CFR50 AND RG 1.99 R.2
BOTH UNITS ORIGINALLY CONTAIN 3 SURVEILLANCE HOLDERS1. 36 Charpy & 10 tension specimens and a dosimeter
with Fe, Ni & Cu wires2. 24 Charpy & 6 tension specimens3. 24 Charpy & 8 tension specimens
June 2009 10
LAGUNA VERDE SURVEILLANCE PROGRAM
CAPSULES WAS RETIRED:
UNIT 1: 1997 (6th RFO)
UNIT 2: 2003 (6th RFO)
UNIT 1: 2008 (13th RFO)
BOTH WERE REINSTALED ON THE 7th OUTAGE , WITH RECONSTITUTED SPECIMENS FOR EXTENDING CURRENT PROGRAM (in order to have surveillance material for License Renewal). LAST WILL BE RECONSTITUTED AND REINSTALED FOR THE 14th RFO OF UNIT 1.
June 2009 11
Beltline plates & welds for unit 1 identification
SURVEILLANCE SPECIMENS
BASE METAL HEAT: C-1888-2WELD METAL HEAT: 3P4966Linde124lot1214
June 2009 12
Beltline plates & welds for unit 2 identification
SURVEILLANCE SPECIMENS
BASE METAL HEAT:C-3869-1WELD METAL HEAT:5P6771 Linde 124 Lot 0342
CHARPY TEST
June 2009 PLIM-VESSEL 13
CHARPY SAMPLE PICTURE
BASE METAL
LCCC93P1-POS9
TEMP: 55 ºf
ENERGY: 116.4 ft-lbf
LATERAL EXP. 70.9 mils
DUCTIL FRACTURE : 45%
TENSION TEST
June 2009 PLIM-VESSEL 14
June 2009 15
LAGUNA VERDE SURVEILLANCE PROGRAM
UNIT/ PLATE HEAT COMP./ Cu-
Ni(%)INITIAL RTNDT °F
ART °F (EFPY)
NEUTRON FLUENCE
U1/22-1-2 C1888-2 0.15/0.51 -2034 (12 EFPY) 8.625 X 1017 n/cm2
54.8 (15.15 EFPY) 1.19X1018 n/cm2
U1/WELD 3P4966LINDE 124LOT1214 0.03/0.9 -6
16.6 (12 EFPY) 8.625 X 1017 n/cm2
26.2 (15.15 EFPY) 1.19X1018 n/cm2
U2/22-1-2 C3869-1 0.12/0.65 -10 41.4 7.35 X 1017 n/cm2
U2/WELD 5P6771LINDE 124LOT0342 0.03/0.88 -48 -22.9 7.35 X 1017 n/cm2
LAGUNA VERDE SURVEILLANCE PROGRAM
June 2009 16
LAGUNA VERDE SURVEILLANCE PROGRAM
June 2009 17
LAGUNA VERDE P-T CURVES
June 2009 18
LAGUNA VERDE P-T CURVES CODE CASE N-640
June 2009 PLIM-VESSEL 19
June 2009 20
CURRENT ACTIVITIES
We are reconstituting the Charpy tested samples by stud welding process.
Sub-size tension test specimens will be obtained from original tested tension samples.
Regulatory body is analyzing the extended power uprate proposal for both units. Here there are several analysis about EPU effect on surveillance program.
CRP 8 OIEA PROJECT ACTIVITIES
June 2009 PLIM-VESSEL 21
Load rate effect on the reference temperature To in a RPV Steel.
CRP 8 IAEA Project activities
June 2009 PLIM-VESSEL 22
June 2009 23
CONCLUSIONS
Transition reference temperature indexed to 30 ft-lbf for Unit 1 and 2 CNLV materials; base metal, weld and HAZ, is in agreement with RG 1.99 Rev.2 predictions and it is not higher than 200 ºF.
In all cases USE magnitude is biger than 50 ft-lb, this meet with 10CFR50 Apendix G.
According to results of 2nd surveillance capsule from Unit 1 and 1st surveillance capsule from Unit 2, RPV materials ductility has not had significative changes.
